Compare Samyang 20mm F1.8 ED AS UMC vs Samyang 50mm F1.4 AS UMC vs Samyang AF 45mm F1.8
Construction
Aperture Blades
7 blades
8 blades
9 blades
Form Factor
Ultra Wide-Angle Prime Lens
Normal Prime Lens
Normal Prime Lens
Image Size
Full-Frame
Full-Frame
Full-Frame
Lens Barrel
Physical aperture ring, Distance scale
Physical aperture ring, Distance scale, DoF scale
Lens Mount
Canon EF-mount, Canon EF-M-mount, Fujifilm X-mount, Micro Four Thirds-mount, Nikon F-mount, Pentax K-mount, Samsung NX-mount, Sony A-mount, Sony E-mount
Canon EF-mount, Nikon F-mount, Pentax K-mount, Sony A-mount, Sony E-mount
Sony E-mount
Material
Composite
Motor
Linear Motor
Optical Formula | Elements
13 elements
9 elements
7 elements
Optical Formula | Groups
12 groups
6 groups
6 groups
Optical Formula | Special Glass
Two aspherical + 3 ED elements, Ultra Multi Coating groups
1 hybrid + 1 aspherical element, Ultra Multi Coating groups
1 ED + 2 aspherical elements, Ultra Multi Coating groups
Dimensions
Filter Diameter
77 mm / 3.03 in
77 mm / 3.03 in
49 mm / 1.93 in
Size | Diameter
83 mm / 3.27 in
82 mm / 3.23 in
62 mm / 2.44 in
Size | Length
88 mm / 3.46 in
75 mm / 2.95 in
56 mm / 2.20 in
Weight
497 g / 17.56 oz
535 g / 18.90 oz
162 g / 5.72 oz
Function
Angle Of View
94.5° Diagonal | 84.0° Horizontal | 61.9° Vertical
46.8° Diagonal | 39.6° Horizontal | 27.0° Vertical
51.4° Diagonal | 43.6° Horizontal | 29.9° Vertical
Aperture
f/1.8 ~ f/22
f/1.4 ~ f/22
f/1.8 ~ f/22
Autofocus
No
No
Yes
Focal Length
20 mm
50 mm
45 mm
Focus Type
Internal
Internal
Internal
Image Stabilization
No
No
No
Weather Resistance
No
No
No
Performance
Max Magnification
0.12x
Min Focus Distance
200 mm / 7.87 in
450 mm / 17.72 in
450 mm / 17.72 in
Production
Accessory
Lens hood included
Lens hood included
Lens hood included
Debut
2016-08-08
2015-09-21
2019-05-13
Made In
Korea
Reviews
Neofiliac score
59%
59%
59%
Pros
- Rather affordable
- Bright maximum aperture
- Beautiful rendering
- Light and compact
- Fast autofocus
- Quite sharp
Cons
- Lacks weather sealing
- Not the highest grade of build
- Lacks weather sealing
- Not Samyang's highest grade of build
- Lacks weather sealing
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